US3803288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of sulfur and iron oxide from pyritic materials
Assignee: Lummus Technology LLC
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Filing: 1972-01-24
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Granted: 1974-04-09
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Expires: 1992-01-24
Abstract
Abstract IRON SULFIDE BEARING MATERIAL IS LEACHED WITH HYDROGEN CHLORIDE AND THE LEACH SOLUTION IS MAINTAINED SATURATED WITH HYDROGEN SULFIDE BY INTRODUCING AND PASSING HYDROGEN SULFIDE THERETHROUGH. THE PH CONDITIONS ARE CON- TROLLED TO RECOVER IRON VALUES ALONE IN THE LEACH LIQUOR OR WITH ZINC AND LEAD VALUES. ZINC AND LEAD VALUES MAY ALSO BE RECOVERED UNDER CONTROLLED CONDITIONS.
Inventors
- 👤 R Burke
- 👤 V Kudryk
- 👤 N Mascio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:49
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/06; C01B17/16; C01B17/165; C01G; C01G49/00; C01G49/02; C01G49/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-08 | 1977-10-08 | 1978-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-08 | 1981-10-08 | 1982-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-08 | 1985-10-08 | 1986-04-09 | $7700.00 | Window Closed / Lapsed |